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Chaplin JD, Christl M, Cundy AB, Warwick PE, Gaca P, Bochud F, Froidevaux P. Time-Integrated Bioavailability Proxy for Actinides in a Contaminated Estuary. ACS ES&T WATER 2022; 2:1688-1696. [PMID: 36277120 PMCID: PMC9578035 DOI: 10.1021/acsestwater.2c00194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 08/05/2022] [Accepted: 08/05/2022] [Indexed: 06/16/2023]
Abstract
Actinides accumulate within aquatic biota in concentrations several orders of magnitude higher than in the seawater [the concentration factor (CF)], presenting an elevated radiological and biotoxicological risk to human consumers. CFs currently vary widely for the same radionuclide and species, which limits the accuracy of the modeled radiation dose to the public through seafood consumption. We propose that CFs will show less dispersion if calculated using a time-integrated measure of the labile (bioavailable) fraction instead of a specific spot sample of bulk water. Herein, we assess recently developed configurations of the diffusive gradients in thin films (DGT) sampling technique to provide a more accurate predictor for the bioaccumulation of uranium, plutonium, and americium within the biota of the Sellafield-impacted Esk Estuary (UK). We complement DGT data with the cross-flow ultrafiltration of bulk seawater to assess the DGT-labile fraction versus the bulk concentration. Sequential elution of Fucus vesiculosis reveals preferential internalization and strong intracellular binding of less particle-reactive uranium. We find significant variations between CF values in biota calculated using a spot sample versus using DGT, which suggest an underestimation of the CF by spot sampling in some cases. We therefore recommend a revision of CF values using time-integrated bioavailability proxies.
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Affiliation(s)
- Joshua D. Chaplin
- Institute
of Radiation Physics, Lausanne University
Hospital and University of Lausanne, 1 Rue du Grand-Pré, Lausanne 1007, Switzerland
| | - Marcus Christl
- Laboratory
of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, Zürich 8093, Switzerland
| | - Andrew B. Cundy
- School
of Ocean and Earth Science, University of
Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, U.K.
| | - Phillip E. Warwick
- School
of Ocean and Earth Science, University of
Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, U.K.
| | - Paweł Gaca
- School
of Ocean and Earth Science, University of
Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, U.K.
| | - François Bochud
- Institute
of Radiation Physics, Lausanne University
Hospital and University of Lausanne, 1 Rue du Grand-Pré, Lausanne 1007, Switzerland
| | - Pascal Froidevaux
- Institute
of Radiation Physics, Lausanne University
Hospital and University of Lausanne, 1 Rue du Grand-Pré, Lausanne 1007, Switzerland
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2
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Chaplin JD, Warwick PE, Cundy AB, Bochud F, Froidevaux P. Novel DGT Configurations for the Assessment of Bioavailable Plutonium, Americium, and Uranium in Marine and Freshwater Environments. Anal Chem 2021; 93:11937-11945. [PMID: 34432435 DOI: 10.1021/acs.analchem.1c01342] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Plutonium, americium, and uranium contribute to the radioactive contamination of the environment and are risk factors for elevated radiation exposure via ingestion through food or water. Due to the significant environmental inventory of these radioelements, a sampling method to accurately monitor their bioavailable concentrations in natural waters is necessary, especially since physicochemical factors can cause significant temporal fluctuations in their waterborne concentrations. To this end, we engineered novel diffusive gradients in thin-film (DGT) configurations using resin gels, which are selective for UO22+, Pu(IV + V), and Am(III) among an excess of extraneous cations. In this work, we also report an improved synthesis of our in-house ion-imprinted polymer resin, which we used to manufacture a resin gel to capture Am(III). The effective diffusion coefficients of Pu, Am, and U in agarose cross-linked polyacrylamide were determined in freshwater and seawater simulants and in natural seawater, to calibrate these configurations for environmental deployments.
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Affiliation(s)
- Joshua D Chaplin
- Institute of Radiation Physics, Lausanne University Hospital and University of Lausanne, 1 Rue du Grand-Pré, CH-1007 Lausanne, Switzerland
| | - Phillip E Warwick
- School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - Andrew B Cundy
- School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, United Kingdom
| | - François Bochud
- Institute of Radiation Physics, Lausanne University Hospital and University of Lausanne, 1 Rue du Grand-Pré, CH-1007 Lausanne, Switzerland
| | - Pascal Froidevaux
- Institute of Radiation Physics, Lausanne University Hospital and University of Lausanne, 1 Rue du Grand-Pré, CH-1007 Lausanne, Switzerland
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3
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Tagami K, Fukaya Y, Hirayama M, Uchida S. Collation of Strontium Concentration Ratios from Water to Aquatic Biota Species in Freshwater and Marine Environments and Factors Affecting the Ratios. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:1637-1649. [PMID: 33428373 DOI: 10.1021/acs.est.0c05710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The fate of strontium-90 (90Sr) from water to aquatic biota is of concern since the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident because of continuous small 90Sr releases to the seawater from the FDNPP site. The Japanese diet includes many edible marine and freshwater species, and the environmental parameter, that is, the concentration ratio (CR) from water to biota, is useful to estimate the potential 90Sr intake, especially from frequently consumed seafoods. However, widely used CR data for radiation dose assessment only have provided values for biota types such as fish, crustaceans, macroalgae, and so forth, and thus, it is difficult to identify specific data for each species. In this study, therefore, we collated CR data of Sr for aquatic biota by surveying available open data sources from the 1950s to 2019, not only for edible parts but also for whole and inedible parts. In total, we obtained 3800 CR data: 3013 data for marine biota, 28 data for brackish water biota, and 759 data for freshwater biota. The results showed that species-specific CRs may decrease the uncertainties compared to those published in IAEA documents; however, different diets and living areas by species may lead to different uncertainties for different species.
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Affiliation(s)
- Keiko Tagami
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
| | - Yukiko Fukaya
- Safety and Environment Analysis Unit, Japan NUS Co., Ltd., Nishi-Shinjuku Prime Square 5F, 7-5-25 Nishi-Shinjuku, Shinjuku-Ku, Tokyo 160-0023, Japan
| | - Makoto Hirayama
- Safety and Environment Analysis Unit, Japan NUS Co., Ltd., Nishi-Shinjuku Prime Square 5F, 7-5-25 Nishi-Shinjuku, Shinjuku-Ku, Tokyo 160-0023, Japan
| | - Shigeo Uchida
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan
- Safety and Environment Analysis Unit, Japan NUS Co., Ltd., Nishi-Shinjuku Prime Square 5F, 7-5-25 Nishi-Shinjuku, Shinjuku-Ku, Tokyo 160-0023, Japan
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4
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Kim SH, Lee SH, Lee HM, Hong GH. Distribution of 239,240Pu in marine products from the seas around the Korean Peninsula after the Fukushima nuclear power plant accident. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2020; 217:106191. [PMID: 32063555 DOI: 10.1016/j.jenvrad.2020.106191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 01/13/2020] [Accepted: 02/04/2020] [Indexed: 06/10/2023]
Abstract
In March 2011, an earthquake caused the shutdown of the active reactors at the Fukushima Daiichi Nuclear Power Plant (NPP), with the succeeding tsunami resulting in the release of radioactively contaminated water into the adjacent Japanese coastal waters. Marine biota selected from various trophic levels were collected in Korean coastal waters throughout 2014 and 2015 and their plutonium levels were measured to evaluate the radioactive contamination levels in the marine organisms that constitute the primary seafood diet in the Republic of Korea (ROK). The results showed that the activity concentrations of 239,240Pu in plankton, macroalgae, mollusks, crustaceans, and cephalopods ranged from 13 to 58, 0.64 to 0.80, 0.94 to 5.40, 0.06 to 0.50, and 0.26 mBq kg-1 of wet weight (w.w.), respectively. The activity concentrations of 239,240Pu measured in the muscles of fish varied from 0.09 to 0.30 mBq kg-1 (w.w.), relatively low values compared to those in other groups regardless of fish species, size, and sampling area. The concentration characteristics of 239,240Pu in the various organs in the respective marine products revealed that the internal organs showed higher concentrations than the muscle or skin (or exoskeleton). The highest concentration of 239,240Pu was measured in the viscera of an abalone, which had an activity concentration of 6.31 mBq kg-1 (w.w.). The concentration factors (CFs) in the >300-μm fraction of plankton and in anchovy, shrimp, and mackerel ranged 67-84% of the International Atomic Energy Agency (IAEA)-recommended values, although the CF in macroalgae was much lower at approximately 5% of IAEA values, suggesting a wide range of 239,240Pu CF in macroalgae. The mean transfer factor (TF) between macroalgae (0.6-0.8 mBq kg-1) and abalone (5.4 mBq kg-1) was estimated to be 7.5, implying that effective Pu transfer occurred between the two species. These figures equate to annual effective doses of 239,240Pu to Koreans through consumption of macroalgae, shellfish, and fish of 1.8 × 10-6, 1.4 × 10-6, and 7.1 × 10-7 mSv yr-1, respectively, and a total dose of 3.9 × 10-6 mSv yr-1, values that are negligible compared to the annual effective dose limit of 1 mSv yr-1.
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Affiliation(s)
- Suk-Hyun Kim
- Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, South Korea
| | - Sang-Han Lee
- Ionizing Radiation Center, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, South Korea.
| | - Hyun-Mi Lee
- Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, South Korea
| | - Gi-Hoon Hong
- Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, South Korea
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5
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Ishii Y, Matsuzaki SIS, Hayashi S. Different factors determine 137Cs concentration factors of freshwater fish and aquatic organisms in lake and river ecosystems. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2020; 213:106102. [PMID: 31761685 DOI: 10.1016/j.jenvrad.2019.106102] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 09/20/2019] [Accepted: 11/08/2019] [Indexed: 06/10/2023]
Abstract
Determination of radionuclide concentration factor (CF) allows estimating the transfer of environmental radionuclides and potential risks of consuming fish contaminated with radionuclides. Although it is known that biotic and abiotic factors affect fish CF, only a few studies have examined whether these factors differ among ecosystems. We estimated radiocesium (137Cs) CF of 30 different fish species and other aquatic organisms by monitoring three lakes and five rivers in Fukushima, 2-4 y after the Fukushima Dai-ichi Nuclear Power Plant accident. The relative effects of biotic and abiotic factors on 137Cs CF in freshwater organisms were compared between river and lake ecosystems using generalized linear models. Our analysis demonstrated the following. (1) The factors critically affecting fish CF differed between rivers and lakes. The negative effects of suspended solid concentration (SS), total organic carbon (TOC), and salinity were significant for rivers, but not for lakes. Biomagnification of 137Cs in piscivore fish was significant only in the lakes. (2) Fish size significantly affected the CF in both rivers and lakes. Nevertheless, the correlation between 137Cs concentration and piscivore fish size was stronger in lakes than in rivers. (3) The SS, TOC, and salinity simultaneously influenced the CF at every trophic level. However, feeding habit was a stronger determinant of 137Cs bioaccumulation than water chemistry in organisms at higher trophic levels, such as aquatic insects, amphibians, and fish. Our findings indicate that 137Cs accumulation in aquatic organisms is ecosystem-dependent due to different environmental factors and food web structure.
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Affiliation(s)
- Yumiko Ishii
- Environmental Impact Assessment Section, Fukushima Branch, National Institute for Environmental Studies, 10-2 Fukasaku, Miharu, Tamura, Fukushima, 963-7700, Japan.
| | - Shin-Ichiro S Matsuzaki
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Seiji Hayashi
- Environmental Impact Assessment Section, Fukushima Branch, National Institute for Environmental Studies, 10-2 Fukasaku, Miharu, Tamura, Fukushima, 963-7700, Japan
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6
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Miwa K, Takeda S, Iimoto T. DEVElOPMENT OF DOSE ESTIMATION SYSTEM INTEGRATING SEDIMENT MODEL FOR RECYCLING RADIOCESIUM-CONTAMINATED SOIL TO COASTAL RECLAMATION. RADIATION PROTECTION DOSIMETRY 2019; 184:372-375. [PMID: 31111924 DOI: 10.1093/rpd/ncz128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Indexed: 06/09/2023]
Abstract
We have developed a dose estimation system integrating assessment methods of radionuclide dispersion in ocean for the case of recycling radiocesium-contaminated soil to coastal reclamation. Radionuclide dispersion in ocean is assessed considering dissolved radionuclide and adsorbed radionuclide on particle by sediment model (OECD/NEA). Time series of Cs-137 dispersion at Fukushima coastal area is assessed by the sediment model and result is almost same with measured value. The major exposure pathways in recycling are estimated by using result of radiocesium dispersion assessment, and internal exposure dose by marine products ingestion is sufficiently lower than external exposure dose of worker.
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Affiliation(s)
- Kazuji Miwa
- Japan Atomic Energy Agency, Ibaraki, Japan
- The University of Tokyo, Chiba, Japan
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7
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Inoue M, Yamashita S, Takehara R, Miki S, Nagao S. Low levels of Fukushima Dai-ichi NPP-derived radiocesium in marine products from coastal areas in the Sea of Japan (2012-2017). Appl Radiat Isot 2019; 145:187-192. [PMID: 30639636 DOI: 10.1016/j.apradiso.2018.12.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 11/27/2018] [Accepted: 12/22/2018] [Indexed: 10/27/2022]
Abstract
Radiocesium concentrations in marine biota in coastal areas of the Sea of Japan were < ~0.005-0.02 Bq/kg-wet and ~0.01-0.18 Bq/kg-wet for 134Cs and 137Cs, respectively (2012-2017). The biota-seawater concentration factors were ~25-100, which approximately agreed with those of 137Cs recorded before FDNPP accident. The low levels of 134Cs in marine biota were likely taken up from ambient seawaters. The total of radiocesium concentrations is now equivalent to that in the 1990s based on the ambient water data.
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Affiliation(s)
- Mutsuo Inoue
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan.
| | - Shiori Yamashita
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan
| | - Ryosei Takehara
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan
| | - Shizuho Miki
- National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4, Fukuura, Kanazawa, Yokohama 236-8648, Japan
| | - Seiya Nagao
- Low Level Radioactivity Laboratory, Kanazawa University, Wake O-24, Nomi, Ishikawa 923-1224, Japan
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8
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Vives I Batlle J, Aoyama M, Bradshaw C, Brown J, Buesseler KO, Casacuberta N, Christl M, Duffa C, Impens NREN, Iosjpe M, Masqué P, Nishikawa J. Marine radioecology after the Fukushima Dai-ichi nuclear accident: Are we better positioned to understand the impact of radionuclides in marine ecosystems? THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 618:80-92. [PMID: 29127871 DOI: 10.1016/j.scitotenv.2017.11.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 11/01/2017] [Accepted: 11/01/2017] [Indexed: 06/07/2023]
Abstract
This paper focuses on how a community of researchers under the COMET (CO-ordination and iMplementation of a pan European projecT for radioecology) project has improved the capacity of marine radioecology to understand at the process level the behaviour of radionuclides in the marine environment, uptake by organisms and the resulting doses after the Fukushima Dai-ichi nuclear accident occurred in 2011. We present new radioecological understanding of the processes involved, such as the interaction of waterborne radionuclides with suspended particles and sediments or the biological uptake and turnover of radionuclides, which have been better quantified and mathematically described. We demonstrate that biokinetic models can better represent radionuclide transfer to biota in non-equilibrium situations, bringing more realism to predictions, especially when combining physical, chemical and biological interactions that occur in such an open and dynamic environment as the ocean. As a result, we are readier now than we were before the FDNPP accident in terms of having models that can be applied to dynamic situations. The paper concludes with our vision for marine radioecology as a fundamental research discipline and we present a strategy for our discipline at the European and international levels. The lessons learned are presented along with their possible applicability to assess/reduce the environmental consequences of future accidents to the marine environment and guidance for future research, as well as to assure the sustainability of marine radioecology. This guidance necessarily reflects on why and where further research funding is needed, signalling the way for future investigations.
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Affiliation(s)
- J Vives I Batlle
- Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium.
| | - M Aoyama
- Institute of Environmental Radioactivity, Fukushima University, Fukushima 960-1296, Japan
| | - C Bradshaw
- Department of Ecology, Environment, and Plant Sciences, Stockholm University, 10691 Stockholm, Sweden
| | - J Brown
- Norwegian Radiation Protection Authority (NRPA), Department of Emergency Preparedness and Environmental Radioactivity, Grini Næringspark 13, Postbox 55, NO-1332, Østerås, Norway
| | - K O Buesseler
- Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States
| | - N Casacuberta
- Laboratory of Ion Beam Physics, ETH-Zurich, Otto Stern Weg 5, 8093 Zurich, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, Environmental Physics, ETH-Zurich, Universitätstrasse 16, 8092 Zurich, Switzerland
| | - M Christl
- Laboratory of Ion Beam Physics, ETH-Zurich, Otto Stern Weg 5, 8093 Zurich, Switzerland
| | - C Duffa
- Institut de Radioprotection et de Sureté Nucléaire (IRSN), Centre de Cadarache, 13115 St Paul Lez Durance, France
| | - N R E N Impens
- Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400 Mol, Belgium
| | - M Iosjpe
- Norwegian Radiation Protection Authority (NRPA), Department of Emergency Preparedness and Environmental Radioactivity, Grini Næringspark 13, Postbox 55, NO-1332, Østerås, Norway
| | - P Masqué
- School of Science and Centre for Marine Ecosystems Research, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia; Departament de Física & Institut de Ciència i Tecnologia Ambientals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - J Nishikawa
- School of Marine Science and Technology, Tokai University, Shizuoka 424-8610, Japan
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9
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Konovalenko L, Bradshaw C, Andersson E, Lindqvist D, Kautsky U. Evaluation of factors influencing accumulation of stable Sr and Cs in lake and coastal fish. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2016; 160:64-79. [PMID: 27153476 DOI: 10.1016/j.jenvrad.2016.04.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 04/06/2016] [Accepted: 04/18/2016] [Indexed: 06/05/2023]
Abstract
As a result of nuclear accidents and weapons tests, the radionuclides Cs-137 and Sr-90 are common contaminants in aquatic ecosystems. Concentration ratios (CR) based on concentrations of stable Cs and Sr in biota and media are used for the estimation of transfer of their radioisotopes for radiation dose calculations in environmental and human safety assessments. Available element-specific CRs vary by over an order of magnitude for similar organisms, thus affecting the dose estimates proportionally. The variation could be reduced if they were based on a better understanding of the influence of the underlying data and how that affects accumulation and potential biomagnification of stable Cs and Sr in aquatic organisms. For fish, relationships have been identified between water concentrations of K and CR of Cs-137, and between water concentrations of Ca and CR of Sr-90. This has not been confirmed for stable Cs and Sr in European waters. In this study, we analysed an existing dataset for stable Cs and Sr, as well as K and Ca, in four Swedish lakes and three Baltic Sea coastal areas, in order to understand the behaviour of these elements and their radioisotopes in these ecosystems. We found significant seasonal variations in the water concentrations of Cs, Sr, K and Ca, and in electrical conductivity (EC), especially in the lakes. CR values based on measurements taken at single or few time points may, therefore, be inaccurate or introduce unnecessarily large variation into risk assessments. Instead, we recommend incorporating information about the underlying variation in water concentrations into the CR calculations, for example by using the variation of the mean. The inverse relationships between fish CR(Cs)-[K]water and fish CR(Sr)-[Ca]water, confirmed that stable Cs and Sr follow the same trends as their radioisotopes. Thus, they can be used as proxies when radioisotope data are lacking. EC was also strongly correlated with K and Ca concentrations in the water and could potentially be used as a quick and cost-effective method to estimate water chemistry to obtain less variable CR. We also recommend some simple improvements to data collection that would greatly enhance our ability to understand Cs and Sr uptake by fish.
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Affiliation(s)
- L Konovalenko
- Department of Ecology, Environment and Plant Sciences, (DEEP), Stockholm University, 10691 Stockholm, Sweden.
| | - C Bradshaw
- Department of Ecology, Environment and Plant Sciences, (DEEP), Stockholm University, 10691 Stockholm, Sweden.
| | - E Andersson
- Swedish Nuclear Fuel and Waste Management Co, (SKB), Box 250, 10124 Stockholm, Sweden.
| | - D Lindqvist
- Department of Environmental Science and Analytical Chemistry, (ACES), Stockholm University, 10691 Stockholm, Sweden.
| | - U Kautsky
- Swedish Nuclear Fuel and Waste Management Co, (SKB), Box 250, 10124 Stockholm, Sweden.
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10
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Pan K, Tan QG, Wang WX. Two-Compartment Kinetic Modeling of Radiocesium Accumulation in Marine Bivalves under Hypothetical Exposure Regimes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:2677-2684. [PMID: 26824250 DOI: 10.1021/acs.est.5b05445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Interpreting the variable concentrations of (137)Cs in the field biological samples requires mechanistic understanding of both environmental and biological behavior of (137)Cs. In this study, we used a two-compartment model to estimate and compare the (137)Cs biokinetics in three species of subtropical marine bivalves. Significant interspecific difference of (137)Cs biokinetics was observed among oysters, mussels, and scallops. There was considerable (137)Cs assimilation from phytoplankton in the bivalves, but the calculated trophic transfer factors were generally between 0.04 and 0.4. We demonstrated a major efflux of radiocesium in the scallops (with a rate constant of 0.207 d(-1)), whereas the efflux was comparable between oysters and mussels (0.035-0.038 d(-1)). A two-compartment kinetic model was developed to simulate the (137)Cs accumulation in the three bivalves under four hypothetical exposure regimes. We showed that the bivalves respond differently to the exposure regimes in terms of time to reach equilibrium, equilibrium concentration, and maximum concentration. Bivalves suffering more frequent intermittent exposure may have higher maximum concentrations than those receiving less frequent exposure. The interspecific difference of (137)Cs accumulation in bivalves has important implications for biomonitoring and implementing management techniques. This study represents one of the first attempts to combine both dissolved and dietary pathways to give a realistic simulation of (137)Cs accumulation in marine bivalves under dynamic exposure regimes.
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Affiliation(s)
- Ke Pan
- Division of Life Science, The Hong Kong University of Science and Technology (HKUST) , Clear Water Bay, Kowloon, Hong Kong
- HKUST Shenzhen Research Institute , Shenzhen 518057, China
| | - Qiao-Guo Tan
- Key Laboratory of the Coastal & Wetland Ecosystems, Ministry of Education, College of the Environment & Ecology, Xiamen University , Xiamen, Fujian 361102, China
| | - Wen-Xiong Wang
- Division of Life Science, The Hong Kong University of Science and Technology (HKUST) , Clear Water Bay, Kowloon, Hong Kong
- HKUST Shenzhen Research Institute , Shenzhen 518057, China
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11
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Tagami K, Uchida S. Consideration on the Long Ecological Half-Life Component of (137)Cs in Demersal Fish Based on Field Observation Results Obtained after the Fukushima Accident. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:1804-1811. [PMID: 26828695 DOI: 10.1021/acs.est.5b04952] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Radiocesium concentrations in most marine fish collected off the coast of Fukushima and surrounding prefectures have decreased with time, and four years after the Fukushima Daiichi Nuclear Power Plant accident occurred, radiocesium concentrations have generally fallen below the detectable level (ca. < 10 Bq kg(-1)-raw). Only in some demersal fish species have detectable concentration levels still been found, and even these species have showed slow radiocesium decreases. The food web was considered as the major factor causing this phenomenon; however, slow elimination rates of radiocesium from these fish species also could be the cause. The latter effect was examined by considering that the (137)Cs concentration decreasing trend in fish could be fit with a set of three exponentially decreasing components; that is, having short, intermediate, and long biological half-lives. The long ecological half-life component was calculated using a 400-1500 d period of monitoring results for Japanese rockfish (Sebastes cheni) and compared with previous reported laboratory results for biological half-life. The obtained ecological half-lives ranged from 274-365 d, and these values agreed with the biological half-life of this fish species. This result implied that the long biological half-lives of radiocesium in some demersal fish species made their radiocesium contamination periods longer.
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Affiliation(s)
- Keiko Tagami
- Office of Biospheric Assessment for Waste Disposal, National Institute of Radiological Sciences , Anagawa 4-9-1, Inage-ku, Chiba 263-8555, Japan
| | - Shigeo Uchida
- Office of Biospheric Assessment for Waste Disposal, National Institute of Radiological Sciences , Anagawa 4-9-1, Inage-ku, Chiba 263-8555, Japan
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12
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Pinder JE, Rowan DJ, Smith JT. Development and evaluation of a regression-based model to predict cesium-137 concentration ratios for saltwater fish. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2016; 152:101-111. [PMID: 26675543 DOI: 10.1016/j.jenvrad.2015.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 11/11/2015] [Accepted: 11/12/2015] [Indexed: 06/05/2023]
Abstract
Data from published studies and World Wide Web sources were combined to develop a regression model to predict (137)Cs concentration ratios for saltwater fish. Predictions were developed from 1) numeric trophic levels computed primarily from random resampling of known food items and 2) K concentrations in the saltwater for 65 samplings from 41 different species from both the Atlantic and Pacific Oceans. A number of different models were initially developed and evaluated for accuracy which was assessed as the ratios of independently measured concentration ratios to those predicted by the model. In contrast to freshwater systems, were K concentrations are highly variable and are an important factor in affecting fish concentration ratios, the less variable K concentrations in saltwater were relatively unimportant in affecting concentration ratios. As a result, the simplest model, which used only trophic level as a predictor, had comparable accuracies to more complex models that also included K concentrations. A test of model accuracy involving comparisons of 56 published concentration ratios from 51 species of marine fish to those predicted by the model indicated that 52 of the predicted concentration ratios were within a factor of 2 of the observed concentration ratios.
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Affiliation(s)
- John E Pinder
- Department of Radiological and Environmental Health Sciences, Colorado State University, 305 W. Magnolia, PMB 231, Fort Collins, CO 80521, USA.
| | - David J Rowan
- Canadian Nuclear Laboratories, Chalk River Laboratories, Chalk River, Ontario K0J 1J0, Canada.
| | - Jim T Smith
- School of Earth and Environmental Science, University of Portsmouth, Portsmouth P01 3 QL, United Kingdom.
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Vives i Batlle J. Dynamic modelling of radionuclide uptake by marine biota: application to the Fukushima nuclear power plant accident. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2016; 151 Pt 2:502-511. [PMID: 25773012 DOI: 10.1016/j.jenvrad.2015.02.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 02/12/2015] [Accepted: 02/18/2015] [Indexed: 06/04/2023]
Abstract
The dynamic model D-DAT was developed to study the dynamics of radionuclide uptake and turnover in biota and sediments in the immediate aftermath of the Fukushima accident. This dynamics is determined by the interplay between the residence time of radionuclides in seawater/sediments and the biological half-lives of elimination by the biota. The model calculates time-variable activity concentration of (131)I, (134)Cs, (137)Cs and (90)Sr in seabed sediment, fish, crustaceans, molluscs and macroalgae from surrounding activity concentrations in seawater, with which to derive internal and external dose rates. A central element of the model is the inclusion of dynamic transfer of radionuclides to/from sediments by factorising the depletion of radionuclides adsorbed onto suspended particulates, molecular diffusion, pore water mixing and bioturbation, represented by a simple set of differential equations coupled with the biological uptake/turnover processes. In this way, the model is capable of reproducing activity concentration in sediment more realistically. The model was used to assess the radiological impact of the Fukushima accident on marine biota in the acute phase of the accident. Sediment and biota activity concentrations are within the wide range of actual monitoring data. Activity concentrations in marine biota are thus shown to be better calculated by a dynamic model than with the simpler equilibrium approach based on concentration factors, which tends to overestimate for the acute accident period. Modelled dose rates from external exposure from sediment are also significantly below equilibrium predictions. The model calculations confirm previous studies showing that radioactivity levels in marine biota have been generally below the levels necessary to cause a measurable effect on populations. The model was used in mass-balance mode to calculate total integrated releases of 103, 30 and 3 PBq for (131)I, (137)Cs and (90)Sr, reasonably in line with previous estimates.
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Johansen MP, Ruedig E, Tagami K, Uchida S, Higley K, Beresford NA. Radiological dose rates to marine fish from the Fukushima Daiichi accident: the first three years across the North Pacific. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:1277-1285. [PMID: 25532541 DOI: 10.1021/es505064d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A more complete record is emerging of radionuclide measurements in fish tissue, sediment, and seawater samples from near the Fukushima Daiichi Nuclear Power Plant (FDNPP) and across the Pacific Ocean. Our analysis of publicly available data indicates the dose rates to the most impacted fish species near the FDNPP (median 1.1 mGy d(-1), 2012-2014 data) have remained above benchmark levels for potential dose effects at least three years longer than was indicated by previous, data-limited evaluations. Dose rates from (134,137)Cs were highest in demersal species with sediment-associated food chains and feeding behaviors. In addition to (134,137)Cs, the radionuclide (90)Sr was estimated to contribute up to approximately one-half of the total 2013 dose rate to fish near the FDNPP. Mesopelagic fish 100-200 km east of the FDNPP, coastal fish in the Aleutian Islands (3300 km), and trans-Pacific migratory species all had increased dose rates as a consequence of the FDNPP accident, but their total dose rates remained dominated by background radionuclides. A hypothetical human consumer of 50 kg of fish, gathered 3 km from the FDNPP in 2013, would have received a total committed effective dose of approximately 0.95 mSv a(-1) from combined FDNPP and ambient radionuclides, of which 0.13 mSv a(-1) (14%) was solely from the FDNPP radionuclides and below the 1 mSv a(-1) benchmark for public exposure.
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Affiliation(s)
- Mathew P Johansen
- Australian Nuclear Science and Technology Organisation , Lucas Heights, NSW 2234, Australia
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Shigenobu Y, Fujimoto K, Ambe D, Kaeriyama H, Ono T, Morinaga K, Nakata K, Morita T, Watanabe T. Radiocesium contamination of greenlings (Hexagrammos otakii) off the coast of Fukushima. Sci Rep 2014; 4:6851. [PMID: 25358378 PMCID: PMC5381365 DOI: 10.1038/srep06851] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 10/10/2014] [Indexed: 12/03/2022] Open
Abstract
We measured the radiocesium (134Cs and 137Cs) contamination of 236 greenlings (Hexagrammos otakii) off the coast of Fukushima Prefecture in Japan, following the accident at the Fukushima Daiichi Nuclear Power Plant in March 2011. The radiocesium concentrations of greenlings caught approximately 40 km south of the power plant were significantly higher than those of greenlings caught approximately 50 km north of the power plant. The radiocesium concentrations of greenlings caught in southern waters were significantly higher in shallow than in deep waters. Meanwhile, two outlier specimens of greenlings with higher 137Cs concentrations, 16,000 Bq/kg-wet on 1 August 2012 and 1,150 Bq/kg-wet on 8 May 2013, were caught approximately 20 km from the power plant. Our calculations suggest that the probability of two such outlier specimens being found off the coast of Fukushima is exceedingly low. By contrast, extremely contaminated greenlings were frequently caught in the power plant port (geometric mean of 137Cs = 17,364 Bq/kg-wet). Our results suggest that the two outlier greenlings with higher 137Cs concentrations migrated from the power plant port. Continued close monitoring of radiocesium concentrations in the area should be done to ensure the safety of food supplies.
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Affiliation(s)
- Yuya Shigenobu
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Ken Fujimoto
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Daisuke Ambe
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Hideki Kaeriyama
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Tsuneo Ono
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Kenji Morinaga
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Kaoru Nakata
- Head office of Fisheries Research Agency, Queen's Tower B 15F, 2-3-3, Minato Mirai, Nishi-ward, Yokohama, Kanagawa. 220-6115, Japan
| | - Takami Morita
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
| | - Tomowo Watanabe
- Research Center for Fisheries Oceanography and Marine Ecosystem, National Research Institute of Fisheries Sciences, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ward, Yokohama, Kanagawa. 236-8648, Japan
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Howard BJ. A new IAEA handbook quantifying the transfer of radionuclides to wildlife for assessment tools. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2013; 126:284-287. [PMID: 24321845 DOI: 10.1016/j.jenvrad.2013.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Affiliation(s)
- B J Howard
- Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Av., Bailrigg, Lancaster LA1 4AP, United Kingdom.
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